This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as Laplace operator, forward difference and symmetric difference (in set theory).
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+2206 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The CLDR project calls this character “increment” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: triangle.
The Wikipedia has the following information about this codepoint:
∆ may refer to:
Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.
Delta (letter) (Δ), a Greek letter also used in mathematics and computer science
Delta baryon (Δ), one of several Baryons consisting of up and down quarks.
alt-J (Δ), a British indie band
Laplace operator (Δ), a differential operator
Increment operator (∆)
Symmetric difference, in mathematics, the set of elements which are in either of two sets and not in their intersection
Representations
System
Representation (click value to copy)
Nº
8710
UTF-8
E2 88 86
UTF-16
22 06
UTF-32
00 00 22 06
URL-Quoted
%E2%88%86
HTML hex reference
∆
Wrong windows-1252 Mojibake
∆
alias
Laplace operator
alias
forward difference
alias
symmetric difference (in set theory)
Encoding: GB18030 (hex bytes)
81 36 D2 32
Encoding: MAC_CYRILLIC (hex bytes)
C6
Encoding: MAC_ICELAND (hex bytes)
C6
Encoding: MAC_LATIN2 (hex bytes)
C6
Encoding: MAC_ROMAN (hex bytes)
C6
Encoding: MAC_TURKISH (hex bytes)
C6
AGL: Latin-2
uni2206
AGL: Latin-3
uni2206
AGL: Latin-4
uni2206
AGL: Latin-5
uni2206
Adobe Glyph List
Delta
Adobe Glyph List
increment
digraph
DE
RFC 5137
\u'2206'
Bash and Zsh inside echo -e
\u2206
C and C++
\u2206
C#
\u2206
CSS
\002206
Excel
=UNICHAR(8710)
Go
\u2206
JavaScript
\u2206
Modern JavaScript since ES6
\u{2206}
JSON
\u2206
Java
\u2206
Lua
\u{2206}
Matlab
char(8710)
Perl
"\x{2206}"
PHP
\u{2206}
PostgreSQL
U&'\2206'
PowerShell
`u{2206}
Python
\u2206
Ruby
\u{2206}
Rust
\u{2206}
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